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  <title>Returns the difference in one or more images</title>

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</div><hr /><div id="imagick.compareimagechannels" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Imagick::compareImageChannels</h1>
  <p class="verinfo">(PECL imagick 2.0.0)</p><p class="refpurpose"><span class="refname">Imagick::compareImageChannels</span> &mdash; <span class="dc-title">Returns the difference in one or more images</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-imagick.compareimagechannels-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">array</span> <span class="methodname"><strong>Imagick::compareImageChannels</strong></span>
    ( <span class="methodparam"><span class="type"><a href="class.imagick.html" class="type Imagick">Imagick</a></span> <code class="parameter">$image</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$channelType</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$metricType</code></span>
   )</div>

  <p class="para rdfs-comment">
   Compares one or more images and returns the difference image.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-imagick.compareimagechannels-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">image</code></em></dt>

     <dd>

      <p class="para">
       Imagick object containing the image to compare.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">channelType</code></em></dt>

     <dd>

      <p class="para">
       Provide any channel constant that is valid for your channel mode. To
       apply to more than one channel, combine channeltype constants using
       bitwise operators. Refer to this
       list of <a href="imagick.constants.html#imagick.constants.channel" class="link">channel constants</a>.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">metricType</code></em></dt>

     <dd>

      <p class="para">
       One of the <a href="imagick.constants.html#imagick.constants.metric" class="link">metric type constants</a>.
      </p>
     </dd>

    
   </dl>

  </p>

 </div>

 <div class="refsect1 returnvalues" id="refsect1-imagick.compareimagechannels-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Array consisting of <em>new_wand</em> and
   <em>distortion</em>.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-imagick.compareimagechannels-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   错误时抛出 ImagickException。
  </p>
 </div>


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